Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Dec. 31, 2012
Summit Global Investments U.S. Low Volatility Equity Fund (Prospectus Summary) | Summit Global Investments U.S. Low Volatility Equity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	SUMMARY SECTION
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Summit Global Investments U.S. Low Volatility Equity Fund (the "Fund") seeks to outperform the S&P 500® Index over a market cycle while reducing overall volatility. There can be no guarantee that the Fund will achieve its investment objective.
Expense [Heading]	rr_ExpenseHeading	Expenses and Fees
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts on Class A Shares if you invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional, in the section of the Prospectus entitled "Shareholder Information -- Sales Charges" and in the section of the Fund's Statement of Additional Information ("SAI") entitled "Purchase and Redemption Information -- Reducing or Eliminating the Front-End Sales Charge."
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. For the fiscal period from February 29, 2012 through August 31, 2012, the Fund's portfolio turnover rate was 95% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	95.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A Shares if you invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	Example:
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Class A and Retail Shares or $1,000,000 in the Class I Shares of the Fund and for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund will invest at least 80% of its net assets (including borrowings for investment purposes) in equity securities, primarily common stocks, of companies within the Russell 1000® Index and S&P 500® Index. The Fund's investments will generally consist of securities, which may include common stocks, preferred stocks, warrants to acquire common stock, and securities convertible into common stock. The Fund purchases equity securities traded in the U.S. on registered exchanges or the over-the-counter market. The Fund's investment adviser attempts to lower the Fund's market risk by investing in U.S. equity securities that lower the overall volatility of the Fund's portfolio as compared to the S&P 500® Index. The Fund invests in stocks that exhibit less volatile stock price patterns, strengthening business metrics (i.e., earnings, debt, return on assets, competition, customers, industry, etc.) and quantitative factors such as earnings variability, leverage, volatility, price/book, price/cash flow, etc. The Fund's investment adviser selects securities for the Fund that it anticipates will produce less volatility with more capital protection and more consistent returns.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Loss of money is a risk of investing in the Fund. In addition, your investment in the Fund may be subject to the following principal risks: o Common Stock Risk. Investments in common stocks are subject to market, economic and business risks that will cause their price to fluctuate over time. Therefore, an investment in the Fund may be more suitable for long-term investors who can bear the risk of these fluctuations. o Management Risk. The Fund is subject to the risk of poor management stock selection. In other words, the individual stocks in the Fund may not perform as well as expected, and/or the Fund's portfolio management practices do not work to achieve their desired result. o Market Risk. The net asset value ("NAV") of the Fund will change with changes in the market value of its portfolio positions. Investors may lose money. Although the Fund will invest in stocks the Fund's investment adviser believes will produce less volatility, there is no guarantee that the stocks will perform as expected. o Opportunity Risk. As with all mutual funds, the Fund is subject to the risk of missing out on an opportunity because the assets necessary to take advantage of it are tied up in less advantageous investments.
Risk Lose Money [Text]	rr_RiskLoseMoney	Loss of money is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance Information
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	No performance information is presented because the Fund has not been operational for a full calendar year. Class A Shares and Retail Shares of the Fund have not commenced operations as of the date of this Prospectus. The Fund intends to evaluate its performance as compared to that of the S&P 500® Index.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	No performance information is presented because the Fund has not been operational for a full calendar year.
Summit Global Investments U.S. Low Volatility Equity Fund (Prospectus Summary) | Summit Global Investments U.S. Low Volatility Equity Fund | CLASS A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.25%
Maximum deferred sales charge (load)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption fee (as a percentage of amount redeemed on shares held for less than 60 days, if applicable)	rr_RedemptionFeeOverRedemption	(1.50%)
Exchange Fee (as a percentage of amount redeemed on shares held for less than 60 days, if applicable)	rr_ExchangeFeeOverRedemption	1.50%
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	19.33%
Total annual Fund operating expenses	rr_ExpensesOverAssets	20.28%
Less Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(19.05%)	[1]
Net expenses	rr_NetExpensesOverAssets	1.23%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-12-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	644
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	4,045
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	6,487
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	9,986
Summit Global Investments U.S. Low Volatility Equity Fund (Prospectus Summary) | Summit Global Investments U.S. Low Volatility Equity Fund | RETAIL CLASS
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption fee (as a percentage of amount redeemed on shares held for less than 60 days, if applicable)	rr_RedemptionFeeOverRedemption	(1.50%)
Exchange Fee (as a percentage of amount redeemed on shares held for less than 60 days, if applicable)	rr_ExchangeFeeOverRedemption	1.50%
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	19.33%
Total annual Fund operating expenses	rr_ExpensesOverAssets	20.28%
Less Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(19.05%)	[1]
Net expenses	rr_NetExpensesOverAssets	1.23%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-12-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	125
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	3,715
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	6,292
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	9,985
Summit Global Investments U.S. Low Volatility Equity Fund (Prospectus Summary) | Summit Global Investments U.S. Low Volatility Equity Fund | CLASS I
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption fee (as a percentage of amount redeemed on shares held for less than 60 days, if applicable)	rr_RedemptionFeeOverRedemption	(1.50%)
Exchange Fee (as a percentage of amount redeemed on shares held for less than 60 days, if applicable)	rr_ExchangeFeeOverRedemption	1.50%
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	19.33%
Total annual Fund operating expenses	rr_ExpensesOverAssets	20.28%
Less Fee waivers and expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(19.05%)	[1]
Net expenses	rr_NetExpensesOverAssets	0.98%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-12-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	10,000
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	366,360
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	623,678
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	996,011

[1] The Fund's investment adviser has contractually agreed to waive management fees and reimburse expenses through December 31, 2013 to the extent that Total Annual Fund Operating Expenses (excluding certain items discussed below) exceed 1.23% for Class A Shares and Retail Shares and 0.98% for Class I Shares. In determining the investment adviser's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account and could cause net Total Annual Fund Operating Expenses to exceed 1.23% or 0.98%, as applicable: acquired fund fees and expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation may not be terminated before December 31, 2013 without the approval of the Board of Directors of The RBB Fund, Inc. If at any time during the three years from January 1, 2013 through December 31, 2015 in which the advisory agreement is in effect, the Fund's Total Annual Fund Operating Expenses for that year are less than 1.23% of the average daily net assets attributable to the Fund's Class A Shares or Retail Shares or less than 0.98% of the average daily net assets attributable to the Fund's Class I Shares, the Adviser is entitled to reimbursement by the Fund of the advisory fees forgone and other payments remitted by the Adviser to the Fund during such three-year period.